Cisco Systems 30 VIP manual Phone Resets

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Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

enabled Cisco IOS Gateway, then check the configuration carefully. IP routing must be enabled (look at the configuration to make sure that “no ip routing” is not found near the beginning of the configuration). Also, make sure that if you’re using RTP header compression to save bandwidth across the WAN, that it is enabled on each router carrying voice traffic that attaches to the WAN circuit. There should not be a situation where the RTP header is compressed on one end but cannot be de-compressed on the other side of the WAN. A sniffer is a very useful tool when troubleshooting one-way audio problems, since you can then verify that the phone or gateway is actually sending or receiving packets. Diagnostic Call Detail Records (CDRs) are useful for determining if a call is experiencing one-way audio since they log transmitted and received packets (see “Lost or Distorted Audio” section). You can also press the ι button twice quickly on a Cisco IP Phone 7960 during an active call to view details about transmitted and received packets.

Note: When a call is muted, no packets will be transmitted from the phone that has pressed the mute button. The Hold button stops the audio stream, so no packets are sent in either direction. When the Hold button is released, all the packet counters are reset. Remember that Silence Suppression must be disabled on both devices for the TX and RX counters to stay equal. Disabling Silence Suppression system-wide will not affect Cisco IOS Gateways.

MTP and One-Way Audio

If you are using Media Termination Point (MTP) in a call (to support supplementary services such as hold and transfer with H.323 devices that do not support H.323 version 2), check to see if the MTP allocated is working correctly. Cisco IOS routers support H.323 version 2 beginning in release 11.3(9)NA and 12.0(3)T. Starting with Cisco IOS release 12.0(7)T, the optional H.323 Open/Close LogicalChannel is supported, so that software-based MTP is no longer required for supplementary services.

The MTP device, as well as Conference Bridge and Transcoder, will bridge two or more audio streams. If the MTP, Conference Bridge, or Transcoder is not working properly, one-way audio or audio loss might be experienced. Shut down MTP to find out if MTP is causing the problem.

Phone Resets

Phones will power cycle or reset for two reasons: 1) TCP failure connecting to

Cisco CallManager, or 2) failure to receive an acknowledgement to the phone’s KeepAlive messages.

Steps for troubleshooting phone resets:

1.Check the phones and gateways to ensure that you are using the latest software loads.

2.Check CCO (Cisco Connection Online at www.cisco.com) for the latest software loads, new patches, or release notes relating to the problem.

3.Check the Event Viewer for instances of phone(s) resetting. Phone resets are considered Information events, as shown in the following illustration.

© 2000 Cisco Systems, Inc.

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Contents SDI Trace Output Configuring Traces Reorder Tone Through Gateways Gateway Registration Problems Page Purpose Documentation Checklist Codec Channel Acronym/Term Cnf Law mu-lawChannel Calling Search Space CCAPi Cisco IOS ClusterFlow Full duplex 711 729 225 245 323 Half Duplex Hookflash Jitter Law mu-lawPartition 931 Route Filter Route Group Route List Route PatternSilence Suppression Voice Activation Detection Voice Activation Detection Silence Suppression VoIP Translation PatternCisco CallManager Administration Details View Report Microsoft PerformanceMicrosoft Event Viewer SDI Trace Configuring Traces SDL Trace Page SDLTraceDataFlag Value SDLTraceTypeFlag Value DefinitionCall Detail Records CDR and Call Management Records CMR Sniffer TraceSelect Service Service Parameters CDRs Voice Quality Problem CategoriesPage Packet Number Time absolute ms Time delta ms Button Help John Check Your Loads Phone Resets Dropped Calls Page Page Cisco CallManager Feature Issues Locations Conf Bridge Region1 Region2 MTP Resource Problems MTP Dial Plans Dialing DOES-NOT-EXIST Page DialPlanWizardG Clause NamePattern Device Name Device Description Usage Pattern PartitionReorder Tone Through Gateways Slow Server ResponseGateway Registration Problems Module.port CFG Booting Dhcp for dynamic configurationTracyclose mod port tracystart mod port TaskID Cmd show dhcp Gmsg ***TFTP Error File Not Found Gmsg CCM#0 CPEvent = Loadid -- CPState = LoadResponse Gatekeeper ProblemsRegistration Rejects RRJ Cisco IP Phone Initialization Process Sample TopologyPage Skinny Station Registration Process Acknowledge Station ResetMessage Description Station Register Station IP PortPage Cisco CallManager Initialization Process Self-Starting Processes Cisco CallManager Registration Process Cisco CallManager KeepAlive Process Cisco CallManager Intra-Cluster Call Flow Traces Cisco Systems, Inc CCMStationD stationOutputStopTone tcpHandle=0x4fbbc30 Cisco Systems, Inc Call Flow Traces Page Cisco Systems, Inc Following debug messages show that the call is in progress Gatekeeper Endpoint Registration Debug Messages and Show Commands on the Cisco IOS GatewayCisco Systems, Inc Page Cisco IOS Gateway with T1/PRI Interface Cisco IOS Gateway with T1/CAS Interface Cisco Systems, Inc Inter-Cluster H.323 Communication Call Flow Traces Failed Call Flow Cisco Systems, Inc Reading Records Writing RecordsRemoving Records Table SchemaFields in a Call Detail Record Known IssuesDeciphering the Time Stamp Originator’s node ID Global Call IdentifierOrigination leg call identifier Date/time of call originationPort for the originator’s media connection Isdn location valueCalling party cause Of call termination IP address for the originator’s media connectionCalled party’s partition Destination span or portIP address to which the call was delivered unsigned integer IP port to which the call was deliveredDate/time of disconnect unsigned integer IP address for the destination outgoing media connectionCodec type used by the destination on sending side Date/time of connectDirectory number used on this call Global Call Identifier for this callCisco CallManager node identifier Call IdentifierLost RTP packets during this connection Interarrival jitter during this connectionLatency experienced during this connection Normal Calls Cisco IP Phone-to-Cisco IP Phone Call Management Records Logged By Call Type Codec Cause Codes Description Codec Types Compression / Payload typesNumber changed Alarms Calling Cisco Technical Assistance Center TAC Index Debug messages and show commands Page Topology

30 VIP specifications

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In summary, the Cisco Systems 30 VIP represents a significant advancement in network technology with its high throughput, integrated security features, adaptability, and intelligent management capabilities. These elements combine to provide a robust solution that meets the evolving needs of modern businesses while ensuring secure and efficient operations. As organizations continue to navigate an increasingly complex digital landscape, the Cisco Systems 30 VIP offers a future-proof option designed to facilitate growth and resilience.
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